Evaluation of the effectiveness of the tooth whitening treatment associated with the immersion in coloring solutions

Resumo

Tooth whitening or dental bleaching is a cosmetic
procedure that has established itself in Dentistry; however, the
staining because of the ingestion of some types of food may cause
several factors leading to the failure of this treatment. Objective:
This study aimed to evaluate in vitro the influence of the immersion
of whitened teeth in solutions with a high degree of pigmentation
on the efficacy of the bleaching performed with 16% hydrogen
peroxide. Material and methods: Fifty-six human teeth were selected,
bleached for 4 hours a day during 14 days and randomly divided
into 7 groups (n = 8). The groups G1/G2 and G3 were immersed
in coloring solutions immediately (IM) after bleaching (AP): G1
– tooth whitening + coffee (IM), G2 – tooth whitening + cola-based
soft drink (IM) and G3 – tooth whitening + red wine (IM); G4/and
G6 were immersed in the solutions for 2 hours (AP), G4 – tooth
whitening + coffee (AP), G5 – tooth whitening + cola based soft
drink (AP), G6 – tooth whitening + red wine and (AP) G7 – control.
After bleaching with an immersion time of 5 minutes, with the aid
of a digital spectrophotometer, the final color (FC) was measured 24
hours after the end of the bleaching treatment (day 15). Results: The
results for ANOVA showed no statistical differences in all groups.
Conclusion: There was no influence on the effectiveness of tooth
whitening immersed in coloring solutions.